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MTDC damping controller based on H-infinity mixed sensitivity theory

A hybrid sensitivity and damping controller technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as system instability and reduce system stability, achieve strong flexibility, improve system stability, and ensure robustness sticky effect

Inactive Publication Date: 2021-02-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lack of DC damping greatly limits the normal and stable working area of ​​the system, resulting in DC low-frequency oscillations, reducing the stability of the system, and even causing the system to become unstable under disturbance conditions

Method used

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  • MTDC damping controller based on H-infinity mixed sensitivity theory
  • MTDC damping controller based on H-infinity mixed sensitivity theory
  • MTDC damping controller based on H-infinity mixed sensitivity theory

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the specific structural and functional details disclosed here are only for the purpose of describing exemplary embodiments.

[0040] figure 1 A flowchart of an MTDC damping controller based on the H∞ hybrid sensitivity theory is provided, and the specific implementation steps are as follows:

[0041] Step A: First, a four-terminal flexible DC power transmission system needs to be built. The system mainly includes four converter stations. The AC side of the converter station is connected to the strong AC power grid, and the DC side is connected to the DC power grid.

[0042] Step B: On the basis of step A, combined with the theoretical basis of H∞ control and mixed sensitivity, the H∞ mixed sensitivity optimization standard structure diagram is obtained.

[0043] Step C: On the basis of Step B, optimize the standard structure accord...

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Abstract

The invention relates to an MTDC damping controller based on an H-infinity mixed sensitivity theory, and the controller is used for the DC oscillation inhibition of a multi-terminal flexible DC powertransmission system (Multi-terminal VSC-HVDC, MTDC), and improves the stability of the MTDC system. The method comprises the steps: establishing a four-terminal MTDC system; based on the H-infinity mixed sensitivity theory, designing an optimal controller under the condition that the system bears the maximum disturbance or the maximum modeling uncertainty exists, and guaranteeing that the designedcontroller has good dynamic performance and operation robustness under different working conditions by selecting a proper weight function; and finally, employing a toolbox of Matlab for solving the optimization problem to obtain the MTDC damping controller. The damping controller can normally and efficiently operate under the condition that the working point of the system is changed, the dynamicperformance of the system is greatly improved, and compared with other damping controllers, the damping controller is more suitable for the situation that the system has strong disturbance and uncertainty.

Description

technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to an MTDC damping controller based on the H∞ mixed sensitivity theory, combined with the H∞ mixed sensitivity theory basis, to improve the dynamic performance of the MTDC and improve system stability. Background technique [0002] In recent years, due to its strong flexibility, reliability and controllability, the multi-terminal flexible DC transmission (Multi-terminal VSC-HVDC, MTDC) technology based on the voltage source converter has developed rapidly. , New energy consumption, asynchronous grid interconnection and weak grid power supply have shown great potential. [0003] The effective removal of DC faults is the prerequisite for the safe and stable operation of VSC-MTDC, but for DC circuit breaker topology, a current-limiting reactor must be connected in series to suppress the fault current to ensure that the fault is cleared normally. For the existing DC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20H02J2003/365Y02E60/60
Inventor 丁安敏周冠宇马文忠田洪英
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)